Productivity & Utility Tools — Calculators & Converters

Practical online utilities for everyday work — converters, calculators, and helpers that run in your browser.

All Hardware & Screen Brain & Cognitive Productivity & Utility Text & Social Games & Fun Education & Reference Media & Arts

Group Expense Splitter & Bill Calculator - Free Tool

Got messy bills from group trips or dinners? This free smart true-up calculator optimizes and reduces your transactions. Generate an ultra-simple settlement plan!

LLM API Cost Calculator 2026 — Compare GPT-5.4, Claude 4.6, DeepSeek

Free Large Language Model (LLM) API cost calculator powered by OpenRouter. Compare GPT-5.4, Claude 4.6, Gemini 3.1, and DeepSeek V3.2. Includes cache hit discounts and context-based tiered pricing computations.

YouTube Channel Analysis & Earnings Estimator - MrBeast Net Worth

Discover how much top YouTubers like MrBeast, PewDiePie, Markiplier, and Dude Perfect make! Analyze any channel revenue with our 2026 dynamic CPM model. Data may have a 1-24 hour delay.

Pomodoro Timer Online

A simple and aesthetic Pomodoro Timer to boost your productivity. Customize your focus and break intervals.

Random Decision Wheel

Can't decide? Spin the wheel to make a random choice instantly. This free online decision wheel picker helps you settle disputes, choose winners, or just have fun.

Unix Timestamp Converter - Epoch Time Tool

Convert Unix timestamp to human-readable date and vice versa. Support for milliseconds, seconds, and timezones. Essential tool for developers to debug Epoch time and fix date parsing errors.

FIRE Calculator - When can I retire? (4% Rule)

Plan your Financial Independence, Retire Early (FIRE) journey. Calculate savings rate, compound interest growth, and retirement age based on the 4% rule. Compare with global users.

Bar Chart Race - Create Animated Bar Chart Race Visualizations Online

Create stunning Bar Chart Race animations in your browser. Upload CSV/Excel files, visualize data racing dynamics. 100% client-side, your data never leaves your device.

Life Progress Bar - Quantify Your Life Canvas

A warm visualization tool for your time. Enter your birthdate to generate your life canvas. See the flow of time, cherish the present, and plan your wonderful life. Your settings are saved locally. We recommend bookmarking this page to visit often.

Buy vs Rent Calculator - Opportunity Cost Analysis

Is buying a house financially better than renting? Calculate the true cost by factoring in home appreciation, investment returns, and opportunity costs. Visualize your net worth over 30 years.

QR Code Generator & Scanner - Create & Read QR Codes Online Free

Free online QR code generator and scanner. Create QR codes for URLs, WiFi, vCard, email, phone and text. Scan QR codes with camera or image upload. No data sent to servers.

Gift Exchange Tracker - Track Gifts & Red Envelopes

Track gifts and monetary exchanges with friends & family. Auto-calculate balances, view per-person timelines, export data. All data stays in your browser.

Regex Tester & Debugger - Online Regular Expression Viewer

Test, debug, and learn Regular Expressions online with real-time highlighting and capture group extraction. 100% private and runs securely in your browser.

Productivity & Utility Tools — Calculators & Converters

Free productivity tools: timestamps, calculators, QR codes, expense split, and more. Instant, private, no signup. Practical online utilities for everyday work — converters, calculators, and helpers that run in your browser.